Very nice. What bothers me it's when the first floor comes in contact with the base floor. Anyway I think this impression will change when one create a more elaborate map with building walls and stuff. Good work.

that workbench is very nice... but what bugs me are the swords..Though they seems sturdy, they have wooden handle(?), also first and second sword from the left are maybe too massive (broad) and imho their handles should be metallic and bigger

i dont like it. it looks too plain. try to use some gradients. also imo u should add some shadows and highlights. maybe something like that:

there is still something wrong with vertical highlight, but that was only quick preview. shadows in place where wall meets floor are necessary to separate them. That kind of trick broke linear placement of planes, adding illusion of 3d.
try to look at walls in in tileset. Jetryl told me to do that, and since that moment it started looks fine.

you could also invert gradient - add black part on bottom and light on top. it radicaly change climate of rooms